/* Shared stylesheet for the Options Mastery course. Used by every module page. */

:root {
  --crawl: #0f9d6e;
  --crawl-bg: #e9f9f2;
  --walk: #2563eb;
  --walk-bg: #eaf1ff;
  --run: #7c3aed;
  --run-bg: #f3ecfe;
  --ink: #1c2128;
  --sub: #586069;
  --line: #e3e6ea;
  --paper: #ffffff;
  --canvas: #f6f7f9;
  --good: #0f7a3d;
  --bad: #b42318;
  --warn: #d97706;
  --ca: #d52b1e;
  --ca-bg: #fdecea;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap { max-width: 820px; margin: 0 auto; padding: 24px 24px 96px; }

/* ---------- Top bar / breadcrumb nav (injected by nav.js) ---------- */
.topbar { background: var(--paper); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.topbar-inner { max-width: 820px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.home-link { font-size: 12.5px; color: var(--sub); text-decoration: none; font-weight: 600; }
.home-link:hover { color: var(--ink); }
.crumb-sep { color: var(--line); font-size: 12px; }
.crumb-mod { font-size: 12.5px; color: var(--ink); font-weight: 600; flex: 1; }
.tabs { display: flex; gap: 4px; }
.tab { font-size: 12.5px; padding: 5px 12px; border-radius: 999px; text-decoration: none; color: var(--sub); font-weight: 600; border: 1px solid transparent; }
.tab:hover { background: var(--canvas); }
.tab.active { background: var(--ink); color: #fff; }
.prevnext { max-width: 820px; margin: 0 auto; padding: 7px 24px 9px; display: flex; justify-content: space-between; font-size: 12px; border-top: 1px dashed var(--line); }
.prevnext a { color: var(--sub); text-decoration: none; }
.prevnext a:hover { color: var(--walk); }
.prevnext span { color: transparent; }

/* ---------- Headings / intro ---------- */
.eyebrow { font-size: 11.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--sub); margin: 28px 0 8px; }
h1 { font-size: 26px; margin: 0 0 10px; letter-spacing: -0.01em; }
h2 { font-size: 19px; margin: 36px 0 10px; letter-spacing: -0.005em; }
h3 { font-size: 15.5px; margin: 22px 0 8px; }
.lede { font-size: 16px; color: var(--sub); max-width: 640px; margin: 0 0 22px; }
p { margin: 0 0 14px; font-size: 15px; }
.section { margin-bottom: 8px; }
a { color: var(--walk); }

/* ---------- Objectives box ---------- */
.objectives { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin-bottom: 28px; }
.objectives h3 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--sub); }
.objectives ul { margin: 0; padding-left: 20px; }
.objectives li { font-size: 14px; margin-bottom: 4px; }

/* ---------- Example / callout / definition boxes ---------- */
.example { background: var(--walk-bg); border-left: 4px solid var(--walk); border-radius: 8px; padding: 14px 18px; margin: 16px 0; }
.example .tag-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--walk); display: block; margin-bottom: 6px; }
.example p:last-child { margin-bottom: 0; }

.callout { border: 1px solid #f1d8a8; border-left: 4px solid var(--warn); background: #fffaf0; padding: 14px 18px; border-radius: 8px; font-size: 13.5px; color: #5c3d0e; margin: 16px 0; }
.callout b { color: #3d2706; }

.danger { border: 1px solid #f3c2bb; border-left: 4px solid var(--bad); background: #fff3f1; padding: 14px 18px; border-radius: 8px; font-size: 13.5px; color: #6b1d12; margin: 16px 0; }
.danger b { color: #4a0f08; }

.dated { border: 1px solid var(--line); border-left: 4px solid var(--sub); background: #f4f5f6; padding: 12px 18px; border-radius: 8px; font-size: 13px; color: var(--sub); margin: 16px 0; }
.dated b { color: var(--ink); }

.fresh { border: 1px solid #f3c6c1; border-left: 4px solid var(--ca); background: var(--ca-bg); padding: 12px 18px; border-radius: 8px; font-size: 13px; color: #7a1810; margin: 16px 0; }
.fresh b { color: #5c1009; }

.sources { background: var(--canvas); border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; margin: 24px 0; font-size: 12px; color: var(--sub); }
.sources h4 { margin: 0 0 8px; font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--sub); }
.sources ol { margin: 0; padding-left: 18px; }
.sources li { margin-bottom: 4px; }
.sources a { color: var(--sub); }

.badge.ca { background: var(--ca-bg); color: #a3271d; }

dfn, .term { font-style: normal; font-weight: 700; color: var(--ink); border-bottom: 1.5px dotted var(--sub); cursor: help; }

.key-takeaways { background: var(--ink); color: #fff; border-radius: 12px; padding: 18px 22px; margin: 32px 0 8px; }
.key-takeaways h3 { color: #fff; margin: 0 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; opacity: .8; }
.key-takeaways ul { margin: 0; padding-left: 18px; }
.key-takeaways li { font-size: 14px; margin-bottom: 6px; color: #e8eaed; }

/* ---------- Tables ---------- */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13.5px; }
th, td { text-align: right; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
th { font-size: 11.5px; text-transform: uppercase; letter-spacing: .03em; color: var(--sub); font-weight: 700; }
tr.hl { background: var(--crawl-bg); font-weight: 700; }

/* ---------- Badges / tags ---------- */
.badge { display: inline-block; font-size: 10px; font-weight: 700; padding: 2px 8px; border-radius: 999px; letter-spacing: .03em; text-transform: uppercase; margin-right: 4px; }
.badge.foundation { background: #eef0f2; color: #52595f; }
.badge.income { background: #e3f7ea; color: #0f7a3d; }
.badge.speculation { background: #fef0e1; color: #a35709; }
.badge.hedging { background: #e3f1fb; color: #0c5e94; }

/* ---------- Visual / interactive pages ---------- */
.panel { display: flex; gap: 24px; align-items: flex-start; flex-wrap: wrap; margin: 8px 0 24px; }
.chart-card { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 18px; flex: 1 1 480px; min-width: 320px; }
.legend { display: flex; gap: 16px; font-size: 12px; color: var(--sub); margin-bottom: 6px; }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.legend i { width: 14px; height: 3px; display: inline-block; border-radius: 2px; }
.stats-row { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.stat { background: var(--canvas); border-radius: 8px; padding: 8px 14px; flex: 1; min-width: 110px; }
.stat span { display: block; font-size: 10.5px; text-transform: uppercase; letter-spacing: .03em; color: var(--sub); margin-bottom: 3px; }
.stat b { font-size: 16px; }
.stat b.pos { color: var(--good); }
.stat b.neg { color: var(--bad); }

.controls { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; flex: 1 1 260px; min-width: 240px; }
.controls h3 { margin: 0 0 14px; font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--sub); }
.ctrl { margin-bottom: 16px; }
.ctrl-row { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 4px; }
.ctrl-row label { font-weight: 600; }
.ctrl-val { color: var(--walk); font-weight: 700; font-variant-numeric: tabular-nums; }
.ctrl input[type=range] { width: 100%; accent-color: var(--walk); }
.ctrl select, .ctrl input[type=number] { width: 100%; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; font-size: 13px; }
.ctrl-note { font-size: 11.5px; color: var(--sub); margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--line); }

/* ---------- Worksheet ---------- */
.problem { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin-bottom: 16px; }
.problem-num { font-size: 11px; font-weight: 700; color: var(--sub); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 6px; }
.problem p { font-size: 14.5px; }
details { margin-top: 10px; }
details summary { cursor: pointer; font-size: 13px; font-weight: 700; color: var(--walk); list-style: none; padding: 7px 12px; background: var(--walk-bg); border-radius: 8px; display: inline-block; }
details summary::-webkit-details-marker { display: none; }
details[open] summary { margin-bottom: 10px; }
.answer-box { background: var(--crawl-bg); border-radius: 8px; padding: 12px 16px; font-size: 13.5px; }
.answer-box .final { font-weight: 700; color: var(--good); }

/* ---------- Footer nav between lecture/visual/worksheet ---------- */
.nav-footer { margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 13px; }
.nav-footer a { text-decoration: none; font-weight: 600; }
.btn { display: inline-block; padding: 9px 16px; border-radius: 8px; background: var(--ink); color: #fff !important; font-size: 13px; font-weight: 600; text-decoration: none; }
.btn.secondary { background: var(--paper); color: var(--ink) !important; border: 1px solid var(--line); }

@media (max-width: 640px) {
  .how-grid, .panel { flex-direction: column; }
}